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dixoncj Samba Member
Joined: June 17, 2004 Posts: 1083 Location: Charleston, SC
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Posted: Tue Jan 30, 2018 12:58 pm Post subject: More powerful fans for my 03 EVC for the pending summer? |
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Sometimes here in Charleston if my 03 EVC's been idling a long time on a really, really hot day, the head pressure builds up on the A/C til the compressor cycles off. It cycles back up though, and basically functions properly. It's just the safeguard kicking in to too much head pressure. And it never does this if the van is moving at pretty much any speed. I've found - through some driveway experimentation - that it won't do this if I have a floor fan directing air onto the grill when it's hotternhell and I'm doing test idles. Makes me think if I put a pair of stronger fans on the radiator, it might mitigate this problem. The a/c works fine, the fans work fine. It doesn't overheat. It just gets too hot for the condenser sometimes when it's been idling in traffic. Anyone have any rec for some really strong replacement fans? |
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greenlaker Samba Member
Joined: December 26, 2016 Posts: 74 Location: Sebastopol, CA
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Posted: Tue Jan 30, 2018 9:24 pm Post subject: Re: More powerful fans for my 03 EVC for the pending summer? |
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I had a similar issue while on vacation this summer - my van would start running hot on the long grades of NV and UT. The t-stat, fans and fan relays had recently been replaced, and the water pump was less than a year old. The radiator had been replaced about two years prior, due to a truck backing into the van and damaging the OEM one.
Turns out the replacement radiator (Nippon I think) didn't seem to function properly. Once an OEM VW unit was sourced (for all of about $250), the issue went away.
I've had other '01 - '03 EVs, this is the first one that had ever given me any grief with running hot. You may want to check the other components in your system before trying to fit fans that pull more air. _________________ '15 Mercedes-Benz Sprinter Crew 144 hi roof
'10 Toyota Prius iii
'01 Honda S2000
'92 Mercedes-Benz 400E |
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dixoncj Samba Member
Joined: June 17, 2004 Posts: 1083 Location: Charleston, SC
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Posted: Thu Feb 01, 2018 8:44 am Post subject: Re: More powerful fans for my 03 EVC for the pending summer? |
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greenlaker wrote: |
I had a similar issue while on vacation this summer - my van would start running hot on the long grades of NV and UT. The t-stat, fans and fan relays had recently been replaced, and the water pump was less than a year old. The radiator had been replaced about two years prior, due to a truck backing into the van and damaging the OEM one.
Turns out the replacement radiator (Nippon I think) didn't seem to function properly. Once an OEM VW unit was sourced (for all of about $250), the issue went away.
I've had other '01 - '03 EVs, this is the first one that had ever given me any grief with running hot. You may want to check the other components in your system before trying to fit fans that pull more air. |
The van itself doesn't run hot or overheat and the radiator is in good shape. I think it's all about the amount of heat/airflow going over the condenser. Even if the A/C cycles off at idle, the temp needle stays pegged at 190 on even the hottest days. That - and the fact that even if it's moving slowly in traffic and generating modest added airflow, the compressor doesn't cycle on/off - make me think it's an airflow issue that might be solved with stronger fans. It's only when it's sitting still and the radiator fans are honking and on high. They just don't seem to move quite enough air to keep the A/C system from temporarily overpressurizing, and tripping the switch. |
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Zeitgeist 13 Samba Member
Joined: March 05, 2009 Posts: 12115 Location: Port Manteau
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Posted: Thu Feb 01, 2018 10:13 am Post subject: Re: More powerful fans for my 03 EVC for the pending summer? |
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I don't think there's much space up there, especially if you have a trans cooler core, but perhaps a couple of small Spal high CFM pusher fans would do the trick. _________________ Casey--
'89 Bluestar ALH w/12mm Waldo pump, PP764 and GT2052
'01 Weekender --> full camper
y u rune klassik? |
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dixoncj Samba Member
Joined: June 17, 2004 Posts: 1083 Location: Charleston, SC
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Posted: Thu Feb 01, 2018 10:16 am Post subject: Re: More powerful fans for my 03 EVC for the pending summer? |
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Zeitgeist 13 wrote: |
I don't think there's much space up there, especially if you have a trans cooler core, but perhaps a couple of small Spal high CFM pusher fans would do the trick. |
yeah - I have a tranny cooler so replacement fans would have to replace stock ones. |
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Abscate Samba Member
Joined: October 05, 2014 Posts: 22668 Location: NYC/Upstate/ROW
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Posted: Fri Feb 02, 2018 8:57 am Post subject: Re: More powerful fans for my 03 EVC for the pending summer? |
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You might be slightly overcharged for that hot climate - you want a little 'less' R134 in hot climates, even though a lot of techs think you put in extra for 'more cooling'
Fail. _________________ .ssS! |
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TDCTDI Samba Advocatus Diaboli
Joined: August 31, 2013 Posts: 12856 Location: North Carolina
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Posted: Fri Feb 02, 2018 9:03 am Post subject: Re: More powerful fans for my 03 EVC for the pending summer? |
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Your supplemental trans cooler may be the culprit by impeding the flow & preheating the air going to the other cooling units, try relocating it & giving it it's own fan. _________________ Everybody born before 1975 has a story, good, bad, or indifferent, about a VW.
GOFUNDYOURSELF, quit asking everyone to do it for you!
An air cooled VW will make you a hoarder.
Do something, anything, to your project every day, and you will eventually complete it. |
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dixoncj Samba Member
Joined: June 17, 2004 Posts: 1083 Location: Charleston, SC
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Posted: Fri Feb 02, 2018 9:13 am Post subject: Re: More powerful fans for my 03 EVC for the pending summer? |
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TDCTDI wrote: |
Your supplemental trans cooler may be the culprit by impeding the flow & preheating the air going to the other cooling units, try relocating it & giving it it's own fan. |
That could be part of the equation - though I might add that it'll do this cycling thing if the van is just sitting idling in my driveway for a long time with the A/C cranked and there's been no 'driving heat' added to the cooler. But this is definitely a possibility - and surely the cooler impedes airflow. Moving it would be a PITA but worth considering perhaps.
As for overcharging. I don't think that's it. I've experimented with that with a buddy who has a full charging/vacuum station. It seems to do best with pretty much exactly what the factory wants.
I do wonder if, thermodynamically, the brutal humidity of Charleston makes the entire removal of heat from the rad/condenser slightly less efficient than if I lived in a desert climate. Thus perhaps more of an argument for more airflow. It's discussions like this where I wish Vanagon curmudgeon/guru Terry Kay wasn't banned. |
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